(19)

(11)

EP 2 158 736 A1

(12)

(43) Date of publication: 03.03.2010 Bulletin 2010/09 (21) Application number: 08750681.2 (22) Date of filing: 22.05.2008

(51) International Patent Classification (IPC):  H04L 25/02(2006.01) H04L 1/06(2006.01) H04L 27/26(2006.01) (86) International application number: PCT/GB2008/001758 (87) International publication number: WO 2008/142419 (27.11.2008 Gazette 2008/48)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR Designated Extension States: AL BA MK RS (30) Priority: 23.05.2007 GB 0709899 (71) Applicant: British Broadcasting Corporation London W1A 1AA (GB)	(72) Inventors: HAFFENDEN, Oliver, Paul London SW17 0TN (GB) NOKES, Christopher, Ryan Betchworth RH3 7EH (GB) STOTT, Jonathan, Highton Horley Surrey RH6 9AR (GB) (74) Representative: Loveless, Ian Mark  Reddie & Grose 16 Theobalds Road GB-London WC1X 8PL GB-London WC1X 8PL (GB)